Sometime before he was killed, Leatherhead appeared in a mini-series paired with Donatello. In the mini-series, the brainy turtle and himself came equipped with extendable battle staffs and worked together to help save a young child in a savage land. In the mini-series, he was very much the same character as portrayed in The Mighty Mutanimals comics.

This version of Leatherhead (like most of the other Mutanimals) made a cameo in All Tomorrow's Yesterdays, as the Mirage Turtles witness alternate universes play out before them. During a fight between the Turtles and Wild West C.O.W.-Boys of Moo Mesa against the cosmic super-beings Galactose, various cracks form across space, time and reality and the Turtles catch a glimpse of their doppelgangers from other dimensions.

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Trivia

Ryan Brown, at different convention appearances, has stated that his character Jess Harley is an homage to his favorite actor, Lance Henriksen, and is named after two characters from his favorite films, Jesse Hucker in Near Dark and Ed Harley from Pumpkinhead.